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Configuration Guide - Network Management and Monitoring

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of Network Management and Monitoring, including SNMP, RMON, NETCONF, OpenFlow, LLDP, NQA, Mirroring, Packet Capture, Packet Trace, Path and Connectivity Detection Configuration, NetStream, sFlow, and iPCA.
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LLDP Transmission and Reception Mechanisms

LLDP Transmission and Reception Mechanisms

LLDP frame transmission

  • After LLDP is enabled on a device, the device periodically sends LLDP frames to neighbors. When the local configuration changes, the device sends LLDP frames to notify neighbors of the changes. To reduce the number of LLDP frames sent when the local information changes frequently, the device waits for a period before sending the next LLDP frame.
  • The device starts fast transmission of LLDP frames in the following scenarios:
    • The device receives an LLDP frame with device information not in its MIB (a new neighbor is discovered).
    • LLDP is enabled.
    • A port transitions from Down to Up state.
    When fast transmission starts, the local device sends an LLDP frame every second. After a specified number of LLDP frames have been sent, the device restores the previous transmission interval.

LLDP frame reception

An LLDP-capable device checks the validity of received LLDP frames and the TLVs in those frames. When determining that an LLDP frame and its TLVs are valid, the local device saves neighbor information and sets the aging time of neighbor information on the local device to the TTL value carried in the received LLDPDU. If the TTL value carried in the received LLDPDU is 0, the neighbor information ages out immediately.

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Updated: 2019-04-20

Document ID: EDOC1100075365

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